John Locke`s Essay Concerning Human Understanding is among the most important books ever written in philosophy. It is a long and complex work dealing with many themes such as the origin of ideas, the extent and limits of human knowledge, the philosophy of perception and morality and religion. This volume is original in that it focuses clearly on the last two of these topics and highlights the importance of these in the book as a whole. It presents an extensive interpretive introduction by the editors and four essays by distinguished contemporary philosophers on Locke`s views on the ethics of belief, personal identity, free will and moral theory. It will interest students and specialists interested in the history of philosophy, political science, religion and history.